Plastic metal molding machine



' A ril 5, 1938. c. ROEHRI PLASTIC METAL MOLDING MACHINE 2 Sheets-Sheet 1 Filed Jan. 14, 1937' v I fluenr: j Carl Roe/271' A ril 5, 1938. I C.ROEHRI I 2,113,410

' PLASTIC METAL MOLDIN Filed Jan. 14, 1937 2 Sheets-Sheet 2 Patented Apr. 5, 1938 UNITED sT 'rEs PATENT OFFICE 4 Claims. (CI. 22-68) The present invention relates to machines for ticularly to that type ,of machine for casting articles by the high pressure method, that is by forcing the material in a plastic state into the mold cavity under. a highpressure.

It is a purpose of the present invention to pro- 'vide a machine of this character with a novel arrangement for measuring and storing the plasticmaterial preparatory to closing the dies and forcing the material under pressure intothe mold cavity. Q

My invention further contemplates the provision in a machine of this character of a novel method of closing the metal receiving well in which the material to be cast is measured and held prior to forcing it into the mold cavity.

More particularly my invention comprises the provision of a novel die structure ofthis character wherein the stationary die is so arranged as to carry botha mold cavity cooperating with the movable die and ply of material to be forced into the mold cavity is held while the dies are closing. The dies may beprovided with any suitable means for causing one of them to move relative to the other,

and any known means may be provided for meastion of the die casting machine embodying the uring out the supply of metal to be placed in the pressure. well.

The features of the present invention are not limited to the means for operating the several parts, but reside in the novel structural features as will hereinafter more fully appear.

In the drawings Fig. 1 is a vertical sectional view through a porinvention;

Fig. 2 is a fragmentary sectional view similar to Fig. 1 showing the dies closed;

Fig. '3 is a sectional view on the line 3-3 of Fig. 2; and

Fig. 4 is a sectional view on the line 4-4 of Fig. 2.

Referring now in detail to the drawings, the present invention is embodied in a casting machine wherein a pair of dies 5 and 6 are ar-' ranged so as to be movable with respect to each other, each -die having a mold cavity therein such as the mold cavity I in the die 5 and the mold cavity 8 in the die 6. The die 5 is a stationary die and is supported upon a bed plate 9 so that the upper surface of the die is tilted at an angle of approximately 30 degrees to the horizontal. The upper die 6 is the movable die and is guided by a plurality of rods such as l making die castings or moldings and more par-.

The cylinder I6 is supported a well in which the sup-'- the level of the lowest toward and away from The particular mechanism by which and I l in its movement the die 5.

' the dies are operated is of no consequence in the present invention. I

The lower die has therein a cylindrical well 5 l2 in which a piston I3 is movable in order that plastic material in the well I2 may be forced outat the upper end thereof. The upper die 6 has a recess M in the lower face thereof through which the plastiematerial may pass 10 from the well l2 into the mold cavity formed by recesses 1 and 8 when the dies are closed as shown in Fig. 2." The piston I3 is operated by a larger piston l5 thereon which'works in a cylinder l6.

upon a lower'frame member I! in which an adjustable stopmember I8 is screw threaded, The stop member lB-extends into the cylinder l6 and may be adjusted up and down by means of a square head l9 thereon to limit the down stroke of the piston l5 and therefore the degree of opening of the well l2.

Inthis way, the capacity of the well I2 may be set for any desired amount. Suitable conduits 20 and 2| may be utilized for applying hydraulic pressure on the opposite sides of the piston I5 as will be readily understood.

For filling the well l2, the die 5 is provided with a semi-cylindrical trough 22 which receives a pouring spout 23 leading from a container 24 for the plastic material. This container may be of any suitable kind and is provided with a valve 25 for controlling the flow of plastic material through an outlet 26 into the pouring spout 23. The trough 22 is preferably of such a depth that, when the material in the well I2 reaches point of its contact with the surface of the die 5 at 21, the level of the material will also be just at the meeting point between the trough 22 and the well l2 at 28.

The upper die is provided with means for closing the trough 22 and sealing the well l2 off from the pouring spout 23. This means comprises a semi-cylindrical projection 29. shaped to fit the trough 22 and adapted to seat in the trough when the upper die is moved down to closed position. The inner face 30 of the projection 29 is shaped to fit the contour of the well l2 so that the piston I3 in its upper movement to empty the well l2 passes over the die face 30 as a continuation of the wall of the well 12. r 5 The construction of the device, it is believed,

. will be readily apparent from the foregoing depair of dies, one .of

The valve 25 isopened, and a measured charge of plastic material is allowed to fill the well II. The amount of material inserted may well be predeterminedat the time of opening the valve 25 so as to just fill the well l2 as shown'in Fig. 1. After this has happened, the next step is to move the die 6 down into closed position or, in other words,- in the position shown in Fig. 2 while the piston l3 remains in the retracted position. After the dies have closed and the projection 29 is seated in the trough 22 so as to seal the well l2, the piston 15 is then moved upward by applying pressure beneath it so as to cause the piston [3 to force the plastic material upwardly from the well l2 through the passageway formed by the recess I4 and into the mold cavity formed by recesses 1 and 8. After the pressure stroke has taken place and the material has set in the dies 1 and 8, sufficient pressure is applied to the topside of the piston l5 so as to withdraw the piston l3 after which the dies are opened and the cast object is removed.

From the above description, it is believed that the construction and advantages of this device will be readily apparent to those skilledin this art.

Having thus described one specific formof my invention, what I claim as new anddesire to secure by Letters Patent is:

1. A device of the character described having a which is movable with respect to the other, said dies having cooperating depressions on their faces adapted to provide a cavity when the dies are against each other to receive a plastic material, one of said dies having'a well therein terminating at the face with which the other die contacts, a piston operating.

in said well, means for supplying plastic or liquid material to be cast to said well, said means comprising a trough in one of the dies, and means on the other die for closing said trough when the dies are pressed together.

2. A device of the character described comprising a lower die having its upper face provided with a mold cavity, means supporting. said die with its upper face tilted to the horizontal, a well in said die above the mold cavity adapted to receive the material to be cast, a piston in said well operable to force the material in said well upwardly to cause it to flow down into the mold cavity, an upper die cooperating with said lower die to seal the mold cavity, and means to fill said well with the material to be cast, said means comprising a trough leading to said well, and means'on the upper die for closing said trough.

3. A device of the character described comprising a lower die havingits upper face provided with a mold cavity, means supporting said die with its upper face tiltedto the horizontal, a well in said die opening upon said upper face at one side of the mold cavity and adapted to receive the materialto be cast, an upper die cooperating with the lower die to seal the mold cavity, one of said dies being recessed between the mold cavity and the well, means to force the material in said well upwardly to the upper face of said lower die to cause it to flow through said recess into the mold cavity, a passage in the lower die for filling said well with material'to be cast,

and means on the upper die for closing said passage.

4. A device of the character described comprising a lower die having its upper face provided CARL ROEHRI. 

